00630nam a22001457a 4500008004100000040005500041245016600096260004500262300001100307650001600318650000600334942001200340999001700352952011500369230524b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  aProceedings of symposium on drilling technology and engineering aids to geological exploration, Calcutta 12th to 15th February 198c/ Geological Survey of India   aNew Delhi: bGovernment of India, c1980  a637p.   aGeological   a   2udccPR  c58302d58302  00102udc40709111185aNSLbNSLcFF/Rk-2/C-15/R-6d2023-08-08l0p80306r2023-08-08 00:00:00w2023-08-08yPR